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Rub the runners of drawers and windows with paraffin wax or an old candle and they will slide more easily. This also works with sliding doors that are hard to open and shut or squeaky.
The door sticks after its been opened up you can't close it unless you get behind it, lift, then push it closed.
If your windows stick, all you have to do is to take a small paint brush and paint the window tracks with a thin coating of petroleum jelly, like Vaseline. The jelly doesn't freeze and your sticky windows will be cured.
Sticking windows, just rub frames with a piece of soap. Then SLIDE SLIDE SLIDE
Editor's Note: I also use old candle wax for my sliding glass door. It works well. Just reapply when it starts to be hard to open.